Question

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant (net) acceleration 34.3 m/s2 . The acceleration period lasts for time 6.00 s until the fuel is exhausted. After that, the rocket is in free fall. True or False.

Answer 1

True

Step-by-step explanation:

t = Time taken = 6 s

u = Initial velocity = 0

v = Final velocity

a = Acceleration = 34.3 m/s²

`v=u+at\\\Rightarrow v=0+34.3* 6\\\Rightarrow v=205.8\ m/s`

After the six seconds the acceleration from the rocket stops. After the fuel is exhausted the velocity of the rocket will be 205.8 m/s which will reduce by the acceleration due to gravity (i.e., 9.81 m/s²).

Free fall is the state of a body where the only the force of gravity is acting on it other forces are not acting on it.

Hence, the statement here is true.